Process for the preparation of l-amino acids using strains of the enterobacteriaceae family which contain an attenuated acek gene

摘要

The invention relates to a process for the preparation of L-amino acids, especially L-lysine, L-valine, L-homoserine and L-threonine, by fermenting a microorganism of the genus Escherichia which has a mutation or deletion in the gene encoding aspartate ammonium lyase (aspA). This mutation results in the loss of aspA enzymatic activity in the microorganism